一根轻弹簧在10.0 N的拉力作用下，长度由原来的5.00 cm伸长为6.00

All of a sudden, Mary was very surprised to find the golden watch she ______ was nowhere to be found. [ ]

A. repaired it

B. which had repaired

C. had repaired

D. had had repaired

Mrs Chen ________ the shopping centre for an hour. She is buying a dress now.

A．has got to

B．has been to

C．has came into

D．has been in

下列统计指标中，属于相对指标的有（）。

A.垦殖率

B.出生人口数

C.森林覆盖率

D.国民总收入

E.平均亩产量

化妆品的标签有以下哪些形式（）

A.印在产品企业产品宣传的产品手册上

B.印在或粘贴在化妆品的销售包装上

C.印在瓶盖内侧

识别、双脉冲译码、填充等脉冲的优先权选择，如果采用C-MOS的模拟选择开关上述三个信号的优先权是靠（）选择的。

A.信号到达的先后的顺序

B.模拟选择开关的地址

C.模拟选择开关的输入序号

D.模拟选择开关的输出序号